JP2015155180A - Sheet production apparatus and sheet production method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet production apparatus which can suppress backflow of waste and fine powder from a recovery vessel on stopping of the apparatus.

SOLUTION: A sheet production apparatus 100 includes a supply portion 10 supplying a fiber-containing material, a fibrillation portion 20 fibrillating the material in the air, a classification portion 30 which classifies the fibrillated product fibrillated in the fibrillation portion into fibrillated matter and waste through an air flow, a formation portion 70 forming a sheet by using the fibrillated matter, and an air discharge blower 88 which discharges waste from the classification portion through an air flow in such a way as to prevent the waste from approaching the formation portion. When the production with the sheet production apparatus 100 is stopped, the supply portion 10, the fibrillation portion 20 and the air discharge blower 88 are stopped in this order.

COPYRIGHT: (C)2015,JPO&INPIT

Description

  The present invention relates to a sheet manufacturing apparatus and a sheet manufacturing method.

  2. Description of the Related Art Conventionally, in a sheet manufacturing apparatus, a so-called wet method is adopted in which a raw material containing fibers is put into water, disaggregated mainly by a mechanical action, and re-made. Such a wet type sheet manufacturing apparatus requires a large amount of water, and the apparatus becomes large. Furthermore, it takes time and effort to maintain the water treatment facility, and energy related to the drying process increases.

  Thus, for the purpose of downsizing and energy saving, a dry sheet manufacturing apparatus that uses water as little as possible has been proposed (see, for example, Patent Document 1).

  In Patent Document 1, a piece of paper is fibrillated in a dry defibrating machine, the fibers are classified into ink grains and deinking fibers in a cyclone, and the deinking fibers are passed through a small hole screen on the surface of the forming drum. It is described that it is deposited on a mesh belt to form a paper.

JP 2012-144819 A

  In the sheet manufacturing apparatus, a material is conveyed to each process by an air current, and various motors are provided for generating an air current in each process. Further, in the sheet manufacturing apparatus, waste such as resin particles and ink particles, fine powder, and the like contained in the raw material are removed. In the sheet manufacturing apparatus described in Patent Document 1, the starting order and stopping order of various motors when the apparatus is started or when the apparatus is stopped are not defined. Therefore, when the apparatus is actually started or when the apparatus is stopped, the removed material may flow backward, and the removed material may be mixed with the sheet.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following aspects or application examples.

(1) One aspect of the sheet manufacturing apparatus according to the present invention is:
A supply unit for supplying a material containing fiber;
A defibrating unit for defibrating the material in air;
A classifying unit that classifies the defibrated material defibrated in the defibrating unit into fiber and waste by airflow;
A molding part for molding a sheet using the fiber,
An exhaust blower for discharging the waste from the classification unit with an air flow so as not to go to the molding unit side, and a sheet manufacturing apparatus comprising:
When the production by the sheet production apparatus is stopped, the supply unit, the defibrating unit, and the exhaust blower are stopped in this order.

  In such a sheet manufacturing apparatus, when the manufacturing of the sheet is stopped, the supply unit, the defibrating unit, and the exhaust blower are stopped in this order, thereby suppressing the backflow of the waste collected by the exhaust blower.

(2) In the sheet manufacturing apparatus according to the present invention,
When the production by the sheet production apparatus is stopped, the defibrating unit may be stopped after the defibrating unit is driven for a time during which the residue in the defibrating unit can be discharged.

  In such a sheet manufacturing apparatus, when the production of the sheet is stopped, the defibrating unit is stopped after the defibrating unit is driven for a time during which the residue in the defibrating unit can be discharged. The load can be reduced.

(3) In the sheet manufacturing apparatus according to the present invention,
Further comprising a blown after defibration that sends the defibrated material to the classification part by airflow;
When the production by the sheet production apparatus is stopped, the supply unit, the defibrating unit, the post-defining blower, and the exhaust blower may be stopped in this order.

  In such a sheet manufacturing apparatus, when the manufacture of the sheet is stopped, the supply unit, the defibrating unit, the blower after defibration, and the exhaust blower are stopped in this order, thereby suppressing the backflow of the waste collected by the exhaust blower. it can.

(4) One aspect of the method for producing a sheet according to the present invention is as follows:
Supplying a material containing fibers by the supply unit;
A step of defibrating the material in the air by a defibrating unit;
A step of classifying the defibrated material that has been defibrated into fiber and waste by airflow by the classifying unit;
A step of forming a sheet using the fiber material by a forming unit;
Discharging the waste from the classification part with an air flow so as not to go to the molding part side by an exhaust blower,
When the production of the sheet is stopped, the supply unit, the defibrating unit, and the exhaust blower are stopped in this order.

  In such a sheet manufacturing method, when the sheet production is stopped, the supply unit, the defibrating unit, and the exhaust blower are stopped in this order, thereby suppressing the backflow of the waste collected by the exhaust blower.

The figure which shows typically the sheet manufacturing apparatus which concerns on this embodiment. The functional block diagram of the sheet manufacturing apparatus which concerns on this embodiment. The flowchart figure which shows the flow of starting control in a 1st Example. The flowchart figure which shows the flow of the stop control in a 1st Example. The flowchart figure which shows the flow of starting control in a 2nd Example. The flowchart figure which shows the flow of the stop control in a 2nd Example. The flowchart figure which shows the flow of starting control in a 3rd Example. The flowchart figure which shows the flow of stop control in a 3rd Example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unduly limit the contents of the present invention described in the claims. In addition, not all of the configurations described below are essential constituent requirements of the present invention.

1. Configuration FIG. 1 is a diagram schematically illustrating a sheet manufacturing apparatus 100 according to the present embodiment. As shown in FIG. 1, the sheet manufacturing apparatus 100 includes a crushing unit 10, a defibrating unit 20, a classification unit 30, a sorting unit 40, a resin supply unit 50, a loosening unit 60, and a molding unit 70. ,including.

  The crushing unit 10 (supply unit) cuts raw materials such as a pulp sheet and a charged sheet (for example, A4-sized waste paper) into air pieces in the air. Although the shape and size of the strip are not particularly limited, for example, it is a strip of several cm square. In the illustrated example, the crushing unit 10 has a crushing blade 11, and the charged raw material can be cut by the crushing blade 11. The crushing unit 10 may be provided with an automatic input unit (not shown) for continuously supplying raw materials. The crushing unit 10 functions as a supply unit that supplies raw materials (materials including fibers). However, as the supply unit, a paper supply unit that supplies the raw materials in a sheet form may be provided.

  The strips cut by the crushing unit 10 are received by the hopper 15 and then conveyed to the defibrating unit 20 via the first conveying unit 81. The first transport unit 81 communicates with the introduction port 21 of the defibrating unit 20. The shape of the 1st conveyance part 81 and the 2nd-6th conveyance parts 82-86 mentioned later is a tubular shape, for example.

  The defibrating unit 20 performs a defibrating process on the fine pieces (defibrated material). The defibrating unit 20 generates fibers that have been unraveled into a fibrous shape by defibrating the strip.

  Here, the “defibration treatment” refers to unraveling a strip formed by binding a plurality of fibers into one fiber. What has passed through the defibrating unit 20 is referred to as “defibrated material”. In addition to the unraveled fibers, the “defibrated material” includes resin particles separated from the fibers when unraveling the fibers (resin for binding multiple fibers), ink, toner, and anti-bleeding material. In some cases, the ink particles may be included. In the following description, the “defibrated material” is at least a part of what has passed through the defibrating unit 20, and what is added after passing through the defibrating unit 20 may be mixed.

  The defibrating unit 20 separates resin particles adhering to the fine pieces and ink particles such as ink, toner, and a bleeding preventing material from the fibers. Resin particles and ink particles are discharged from the discharge port 22 together with the defibrated material. The defibrating unit 20 performs a defibrating process on the strip introduced from the introduction port 21 with a rotary blade. The defibrating unit 20 performs defibration in a dry manner in the air.

  The defibrating unit 20 preferably has a mechanism for generating an airflow. In this case, the defibrating unit 20 can suck the fine pieces together with the airflow from the introduction port 21 by the airflow generated by itself, perform the defibrating process, and convey the strip to the discharge port 22. The defibrated material discharged from the discharge port 22 is introduced into the classification unit 30 via the second transport unit 82. In addition, when using the defibrating part 20 which does not have an airflow generation mechanism, you may provide the mechanism which generate | occur | produces the airflow which guides a strip to the inlet 21 by external attachment.

  The defibrated material discharged from the discharge port 22 is introduced into the classification unit 30 via the second transport unit 82. The second transport unit 82 is provided with a defibrated blower 87 that generates an air flow that guides the defibrated material to the classifying unit 30. When the defibrating unit 20 has an air flow generation mechanism, the post-defining blower 87 may be omitted as a configuration of the sheet manufacturing apparatus 100.

  The classification unit 30 separates and removes resin particles and ink particles from the defibrated material. As the classification unit 30, an airflow classifier is used. The airflow classifier generates a swirling airflow and separates it according to the size and density of what is classified as centrifugal force, and the classification point can be adjusted by adjusting the velocity and centrifugal force of the airflow. Specifically, a cyclone, an elbow jet, an eddy classifier, or the like is used as the classification unit 30. In particular, since the structure of the cyclone is simple, it can be suitably used as the classification unit 30. Below, the case where a cyclone is used as the classification part 30 is demonstrated.

  The classifying unit 30 has at least an introduction port 31, a lower discharge port 34 provided in the lower portion, and an upper discharge port 35 provided in the upper portion. In the classifying unit 30, the airflow on which the defibrated material introduced from the introduction port 31 is moved in a circumferential direction. As a result, centrifugal force is applied to the introduced defibrated material, so that the fiber material (disentanglement) Fiber) and waste (resin particles, ink particles) having a lower density than the fiber material. The fiber material is discharged from the lower discharge port 34 and is introduced to the introduction port 46 of the sorting unit 40 through the third transport unit 83. On the other hand, the waste is discharged from the upper discharge port 35 to the outside of the classification unit 30 and introduced into the waste collection container 90 through the fourth transport unit 84. The fourth transport unit 84 is provided with an exhaust blower 88 that generates an air flow that discharges waste from the classification unit 30 and guides it to the waste collection container 90.

  In addition, although described that it isolate | separates into a fiber and a waste by the classification | category part 30, it cannot necessarily be separated correctly. A relatively small thing or a low density thing of a textile thing may be discharged outside with waste. In addition, waste that is relatively dense or entangled with the fiber may be introduced into the sorting unit 40 together with the fiber. In the present application, what is discharged from the lower discharge port 34 (those containing a long fiber more than waste) is called “fiber”, and what is discharged from the upper discharge port 35 (a proportion containing long fibers is a fiber). Less waste) is called "waste".

  The sorting unit 40 sorts the fiber separated by the classifying unit 30 into “passage” that passes through the sorting unit 40 and “residue” that does not pass through in the air. As the sorting unit 40, a sieve is used. The sorting unit 40 has an introduction port 46 and a discharge port 47. The sorting unit 40 is a rotary sieve in which a cylindrical mesh unit is rotated by a motor (not shown). The net part of the sorting part 40 has a plurality of openings, and the inside of the net part is hollow. By rotating the mesh part, the fiber material introduced into the mesh part passes through the opening having a size that can pass through the opening, and does not pass the fiber article having a size that cannot pass through the opening. The sorting unit 40 can sort fibers (passed material) shorter than a certain length from the fiber material using a sieve. The mesh part is composed of a wire mesh such as a plain weave wire mesh or a welded wire mesh. In addition, in the selection part 40, instead of the net part comprised of the metal mesh, an expanded metal obtained by extending a cut metal plate may be used, or a punching metal in which a hole is formed in the metal plate with a press machine or the like. It may be used. In the case of using expanded metal, the opening is a hole formed by extending a cut formed in a metal plate. When using a punching metal, the opening is a hole formed in a metal plate with a press or the like. Moreover, you may make the member which has an opening with materials other than a metal. Note that the sorting unit 40 may be omitted as a configuration of the sheet manufacturing apparatus 100.

  Residue that has not passed through the sieve of the sorting unit 40 is discharged from the discharge port 47, transported to the hopper 15 through the fifth transport unit 85 as a return channel, and returned to the defibrating unit 20 again. On the other hand, the passing material that has passed through the sieve of the sorting unit 40 is received by the hopper 16 and then transferred to the inlet 66 of the loosening unit 60 via the sixth transfer unit 86. The sixth transport unit 86 is provided with a supply port 51 for supplying a resin that binds fibers (bonds defibrated materials).

  The resin supply unit 50 supplies resin in the air from the supply port 51 to the sixth transport unit 86. That is, the resin supply unit 50 supplies resin to a path (between the selection unit 40 and the loosening unit 60) where the passing material that has passed through the opening of the selection unit 40 travels from the selection unit 40 to the loosening unit 60. Although it will not specifically limit as the resin supply part 50 if resin can be supplied to the 6th conveyance part 86, A screw feeder, a circle feeder, etc. are used. The resin supplied from the resin supply unit 50 is a resin for binding a plurality of fibers. When the resin is supplied to the sixth transport unit 86, the plurality of fibers are not bound. The resin is cured when passing through the molding unit 70 described later, and binds a plurality of fibers. The resin is a thermoplastic resin or a thermosetting resin, and may be fibrous or powdery. The amount of resin supplied from the resin supply unit 50 is appropriately set according to the type of sheet to be manufactured. In addition to the resin that binds the fibers, a colorant for coloring the fibers and an aggregation preventing material for preventing aggregation of the fibers may be supplied depending on the type of the sheet to be produced. Note that the resin supply unit 50 may be omitted as a configuration of the sheet manufacturing apparatus 100.

  The resin supplied from the resin supply unit 50 is mixed with the passing material that has passed through the opening of the sorting unit 40 by the transport blower 89 provided in the sixth transport unit 86. The transport blower 89 generates an air flow for transporting the passing material and the resin to the loosening unit 60 while mixing the passed material and the resin.

  The loosening unit 60 loosens tangled passing objects. Furthermore, the loosening part 60 loosens the entangled resin when the resin supplied from the resin supply part 50 is fibrous. Further, the loosening unit 60 uniformly deposits the passing material and the resin on the deposition unit 72 described later. In other words, the term “unwind” includes the action of breaking up intertwined things and the action of depositing them uniformly. If there is no entanglement, the film is uniformly deposited. As the loosening part 60, a sieve is used. The loosening part 60 is a rotary sieve whose net part is rotated by a motor (not shown). Here, the “sieving” used as the loosening unit 60 may not have a function of selecting a specific object. That is, the “sieving” used as the unraveling part 60 means a thing provided with a net part having a plurality of openings, and the unraveling part 60 removes all of the fiber and resin introduced into the unraveling part 60. , It may be discharged outside through the opening. In this case, the size of the opening of the loosening unit 60 is set to be equal to or larger than the size of the opening of the sorting unit 40. The difference in configuration between the loosening unit 60 and the sorting unit 40 is that the loosening unit 60 does not have a discharge port (a portion corresponding to the discharge port 47 of the sorting unit 40). Note that the loosening unit 60 may be omitted as a configuration of the sheet manufacturing apparatus 100.

  In a state where the loosening portion 60 is rotating, the mixture of the passing material (fiber) and the resin that has passed through the sorting portion 40 is introduced from the introduction port 66 into the loosening portion 60 formed of a cylindrical net portion. The mixture introduced into the loosening part 60 moves to the mesh part side by centrifugal force. As described above, the mixture introduced into the loosening part 60 may contain entangled fibers and resin, and the entangled fibers and resin are loosened in the air by the rotating mesh part. The loosened fibers and resin pass through the openings. The fibers and the resin that have passed through the openings pass through the air and are uniformly deposited on the deposition portion 72 described later.

  The fiber and the resin that have passed through the opening of the loosening part 60 are deposited on the deposition part 72 of the molding part 70. The forming unit 70 includes a deposition unit 72, a stretching roller 74, a heater roller 76, a tension roller 77, and a take-up roller 78. The forming unit 70 forms a sheet using the defibrated material and the resin that have passed through the loosening unit 60.

  The depositing part 72 of the molding part 70 receives and deposits the fiber and resin that have passed through the opening of the loosening part 60 to generate a deposit. The deposition part 72 is located below the loosening part 60. The accumulation unit 72 is, for example, a mesh belt. A mesh stretched by a stretch roller 74 is formed on the mesh belt. The deposition unit 72 moves as the stretching roller 74 rotates. A web having a uniform thickness is formed on the deposition portion 72 by the defibrated material and the resin continuously falling from the loosening portion 60 while the deposition portion 72 continuously moves.

  Below the deposition unit 72, a suction device 79 (suction unit) that sucks the deposit from below is provided. The suction device 79 is positioned below the unwinding unit 60 via the deposition unit 72 and generates a downward airflow (an airflow from the unwinding unit 60 toward the deposition unit 72). As a result, the defibrated material and the resin dispersed in the air can be sucked, and the discharging speed from the loosening unit 60 can be increased. As a result, the productivity of the sheet manufacturing apparatus 100 can be increased. Further, the suction device 79 can form a downflow in the defibrated material and resin dropping path, and can prevent the defibrated material and the resin from being entangled during the dropping. A fine powder collection container 92 is connected to the suction device 79, and fine powder (paper powder, fine resin, etc.) having a size that passes through the mesh of the deposition portion 72 is finely divided by the air flow generated by the suction device 79. It is introduced into the recovery container 92. Of the waste that could not be removed by the classification unit 30, fine powder of a minute size is collected here.

  The defibrated material and the resin deposited on the deposition unit 72 of the molding unit 70 are heated and pressurized by passing through the heater roller 76 as the deposition unit 72 moves. By heating, the resin functions as a binder to bind the fibers together, is thinned by pressurization, and further passes through a calendar roller (not shown) to smooth the surface, whereby the sheet P is formed. In the illustrated example, the sheet P is wound up by a winding roller 78. Thus, the sheet P can be manufactured.

  FIG. 2 shows a functional block diagram of the sheet manufacturing apparatus 100. The sheet manufacturing apparatus 100 includes a control unit 110 including a CPU and a storage unit (ROM, RAM), and an operation unit 120 for inputting operation information.

  The control unit 110 outputs control signals to the first to sixth drivers (motor drivers) 111 to 116. The first driver 111 controls the motor of the defibrating unit 20 based on the control signal to drive the defibrating unit 20. The second driver 112 controls the motor of the blower 87 after defibration based on the control signal to drive the blower 87 after defibration. The third driver 113 drives the exhaust blower 88 by controlling the motor of the exhaust blower 88 based on the control signal. The fourth driver 114 drives the transport blower 89 by controlling the motor of the transport blower 89 based on the control signal. The fifth driver 115 drives the suction device 79 by controlling the motor of the suction device 79 based on the control signal. The sixth driver 116 controls the motor of the crushing unit 10 based on the control signal to drive the crushing unit 10.

  The control unit 110 outputs a control signal to the first to sixth drivers 111 to 116 to drive various motors when the operation information instructing activation (start of manufacture) is received from the operation unit 120. When the operation information instructing to stop the apparatus is received from the operation unit 120, the control signals are output to the first to sixth drivers 111 to 116 to stop the driving of the various motors.

2. Next, a method for starting / stopping control in the sheet manufacturing apparatus 100 according to the present embodiment will be described.

  In the sheet manufacturing apparatus 100 of the present embodiment, the material is conveyed to each process by an air flow. In the sheet manufacturing apparatus 100, the structure that generates the airflow is the defibrating unit 20, the defibrated blower 87, the exhaust blower 88, the transport blower 89, and the suction device 79 (suction unit). The defibrating unit 20 and the defibrated blower 87 generate airflow from the defibrating unit 20 toward the classifying unit 30, and the exhaust blower 88 generates airflow from the upper outlet 35 of the classifying unit 30 toward the waste collection container 90. The conveying blower 89 generates an air flow from the sorting unit 40 toward the unwinding unit 60 (when the sheet manufacturing apparatus 100 does not include the sorting unit 40 and the unraveling unit 60, an air flow from the classification unit 30 toward the deposition unit 72). The suction device 79 generates an air flow from the loosening unit 60 toward the fine powder collection container 92.

  Here, depending on the order of starting each component that generates airflow when the apparatus is activated or the order of stopping each component that generates airflow when the apparatus is stopped, an airflow from the waste collection container 90 toward the classification unit 30 is generated. Thus, waste may flow backward from the waste collection container 90, or an air flow from the fine powder collection container 92 toward the loosening unit 60 may occur, causing fine powder to flow backward from the fine powder collection container 92. The backflow of waste or fine powder creates a sheet in which the removed waste or fine powder is mixed, which can cause deterioration of the quality of the sheet. In the sheet manufacturing apparatus 100 according to the present embodiment, each component that generates an air flow when the apparatus is activated is activated in an appropriate order, and each component that generates an air current when the apparatus is stopped is stopped in an appropriate order, thereby reducing waste. Suppresses the backflow of fine powder.

2-1. First Embodiment FIG. 3 is a flowchart showing a flow of start control in the first embodiment.

  When the apparatus is activated (at the start of manufacture) in the first embodiment, first, the control unit 110 outputs a control signal to the third driver 113 and the fifth driver 115, and the exhaust blower 88 and the suction device 79. (Suction unit) is activated (step S10).

  By starting the exhaust blower 88 first, an air flow toward the waste collection container 90 can be generated, and the waste can be prevented from flowing backward from the waste collection container 90. In addition, by starting the suction device 79 first, an air flow toward the fine powder collection container 92 can be generated, and the fine powder can be prevented from flowing backward from the fine powder collection container 92.

  Further, since the exhaust blower 88 and the suction device 79 generate airflows in opposite directions, when the suction device 79 is started with the exhaust blower 88 stopped, the airflow from the waste collection container 90 to the classification unit 30 When the exhaust blower 88 is activated in a state where the suction device 79 is stopped, there is a possibility that a waste stream (air stream that causes the waste to flow backward) is generated. Airflow) may occur. Therefore, the exhaust blower 88 and the suction device 79 are controlled so as to be activated at the same time so that this situation does not occur. It is not necessary to activate the exhaust blower 88 and the suction device 79 at the same time exactly. The other one is activated before the influence of the air flow when the exhaust blower 88 or the suction device 79 is activated affects the other. do it. Here, “influencing” means that an air flow is generated so that waste and fine powder flow backward. Since the exhaust blower 88 and the suction device 79 are located some distance apart, and the airflow does not reach the maximum immediately after activation, a slight deviation in the activation timing of both is allowed.

  After the exhaust blower 88 is activated, the control unit 110 outputs a control signal to the second driver 112 to activate the blower 87 after defibration (step S12). Here, the control unit 110 activates the post-defibration blower 87 after the exhaust blower 88 starts to move stably. “Stable movement” means that the motor is in a steady state. For example, the third driver 113 detects the rotational speed of the motor of the exhaust blower 88 and outputs a predetermined signal to the control unit 110 when the rotational speed reaches a predetermined value (rotational speed in a steady state). If configured to do so, the control unit 110 determines that the exhaust blower 88 has started to move stably when the predetermined signal is received from the third driver 113, and the blower 87 after defibration. Start up.

  By starting the blower 87 after defibrating prior to the defibrating unit 20, when material remains in the defibrating unit 20, it is possible to reduce a load when the defibrating unit 20 is activated. That is, if the material remains in the defibrating unit 20, a load is applied when the defibrating unit 20 is activated, and if the load at the time of activation is large, the starting torque may not be sufficient to start.

  After the defibrating blower 87 starts to move stably, the control unit 110 outputs a control signal to the first driver 111 to activate the defibrating unit 20 (step S14). Note that after the defibrating blower 87 starts to move stably, the defibrating unit 20 may be activated after waiting for several seconds in order to remove the material in the defibrating unit 20.

  After the suction device 79 starts to move stably, the control unit 110 outputs a control signal to the fourth driver 114 and activates the transport blower 89 (step S16). The transport blower 89 may be activated after both the exhaust blower 88 and the suction device 79 start to move stably. Since the transport blower 89 generates an air flow in a direction opposite to the air flow generated by the exhaust blower 88, the waste blower 88 is activated before the transport blower 89 so that waste is collected from the waste collection container 90. Backflow can be prevented. After the defibrating unit 20 starts to move stably, the control unit 110 outputs a control signal to the sixth driver 116 and activates the crushing unit 10 (supply unit) (step S18).

  FIG. 4 is a flowchart showing the flow of stop control in the first embodiment.

  When the apparatus is stopped (when manufacturing is stopped) in the first embodiment, first, the control unit 110 outputs a control signal to the sixth driver 116 to stop the crushing unit 10 (supply unit) (step). S24). If the material remains in the defibrating unit 20, it becomes a load at the next start-up of the defibrating unit 20. Therefore, first, by stopping the crushing unit 10, the supply of the material to the defibrating unit 20 is stopped and the defibrating unit 20 is prevented from progressing.

  Next, the control part 110 outputs a control signal to the 1st driver 111 and the 4th driver 114, and stops the defibrating part 20 and the conveyance blower 89 (step S26, S27). Here, the control unit 110 stops the defibrating unit 20 after rotating the defibrating unit 20 for a predetermined time during which the material (residue) accumulated in the defibrating unit 20 can be discharged. Note that “discharging the residue” means discharging the amount that can be discharged by the rotational drive of the defibrating unit 20, and does not mean discharging the residue in the defibrating unit 20. By discharging the residue in the defibrating unit 20 when the apparatus is stopped, the load at the next start-up of the defibrating unit 20 can be reduced.

  After the defibrating unit 20 stops, the control unit 110 outputs a control signal to the second driver 112 to stop the blower 87 after defibrating (step S28).

  After the defibrating blower 87 stops, the control unit 110 outputs a control signal to the third driver 113 to stop the exhaust blower 88, and after the conveyance blower 89 stops, the fifth driver 115 A control signal is output to stop the suction device 79 (step S30). By stopping the exhaust blower 88 last, it is possible to prevent the waste from flowing backward from the waste collection container 90 without generating an air flow from the waste collection container 90 to the classification unit 30. In addition, by stopping the suction device 79 lastly, it is possible to prevent the fine powder from flowing backward from the fine powder collection container 92 without generating an air flow from the fine powder collection container 92 toward the loosening unit 60, The fine powder to be collected can be recovered to the end. Although it is desirable to stop the exhaust blower 88 and the suction device 79 at the same time, stop the other before the influence of the airflow when stopping one of the exhaust blower 88 and the suction device 79 affects the other. That's fine.

2-2. Second Embodiment FIG. 5 is a flowchart showing the flow of start control in the second embodiment.

  There is no air release portion in the piping and device between the exhaust blower 88 and the suction device 79, and the air flow rate generated by the exhaust blower 88 and the air flow rate generated by the transport blower 89 and the suction device 79 If there is a large difference between them, the airflows may interfere with each other. For example, when the transport blower 89 is started after the exhaust blower 88 and the suction device 79 are started, the flow rate of the air flow generated by the transfer blower 89 and the suction device 79 is greater than the flow rate of the air flow generated by the exhaust blower 88. Is significantly large, an air flow from the waste collection container 90 toward the classification unit 30 may be generated. In the second embodiment, the post-defibration blower 87 and the defibrating unit 20 are activated prior to the transport blower 89 so as to avoid such a situation. Since the hopper 15 is connected to the upstream side of the defibrating blower 87 and the defibrating unit 20 and is open to the atmosphere, even if the blower 87 after defibrating and the defibrating unit 20 are activated, the waste Airflow from the collection container 90 toward the classification unit 30 is not generated.

  That is, when the device is activated in the second embodiment, the control unit 110 first activates the exhaust blower 88 and the suction device 79 (step S32), and after the exhaust blower 88 and the suction device 79 start to move stably, After the defibrating blower 87 is activated (step S34) and the defibrated blower 87 starts to move stably, the defibrating unit 20 is activated (step S36), and after the defibrating unit 20 starts to move stably, it is conveyed. The blower 89 is activated (step S38). Then, the control part 110 outputs a control signal to the 6th driver 116, and starts the crushing part 10 (supply part) (step S40).

  FIG. 6 is a flowchart showing the flow of stop control in the second embodiment.

  When the apparatus is stopped in the second embodiment, the conveying blower 89 is stopped before the post-defibrating blower 87 and the defibrating unit 20 contrary to when the apparatus is activated. First, the control unit 110 stops the crushing unit 10 (supply unit) (step S46), then stops the transport blower 89 (step S48), and stops the defibrating unit 20 after the transport blower 89 stops. After the defibrating unit 20 is stopped (step S50), the defibrated blower 87 is stopped (step S52). Step S54 in FIG. 6 is the same as step S30 in FIG.

2-3. Third Embodiment FIG. 7 is a flowchart showing the flow of activation control in the third embodiment.

  Considering the case where fine powder remains in the piping path before the apparatus is activated, it is conceivable to start up in order from the portion near the fine powder collection container 92. By collecting the fine powder from the portion near the fine powder collecting container 92, the fine powder remaining in the pipe can be removed without clogging the pipe. For example, if the blower 87 after defibrating and the defibrating unit 20 are started in a state where the transport blower 89 is stopped, fine powder or the like may stay on the upstream side of the transport blower 89 and cause clogging of the piping. Therefore, in the third embodiment, the conveyance blower 89 is activated before the blower 87 after defibrating and the defibrating unit 20 so as not to be in such a situation.

  That is, when the apparatus is activated in the third embodiment, first, the control unit 110 activates the exhaust blower 88 and the suction apparatus 79 (step S56), and after the exhaust blower 88 and the suction apparatus 79 start to move stably, the conveyance is performed. After the blower 89 is activated (step S58) and the conveying blower 89 starts to move stably, the blower 87 after defibration is activated (step S60), and after the defibrating blower 87 starts to move stably, the defibrating unit 20 is started (step S62). Thereafter, the control unit 110 outputs a control signal to the sixth driver 116 to activate the crushing unit 10 (supply unit) (step S64).

  FIG. 8 is a flowchart showing the flow of stop control in the third embodiment.

  When the apparatus is stopped in the third embodiment, the defibrated blower 87 and the defibrating unit 20 are stopped prior to the conveying blower 89, contrary to when the apparatus is activated. First, the control unit 110 stops the crushing unit 10 (supply unit) (step S70), then stops the defibrating unit 20 (step S72), and after the defibrating unit 20 stops, the blower after defibrating 87 is stopped (step S74), and after the defibrating blower 87 is stopped, the transport blower 89 is stopped (step S76). Step S78 in FIG. 8 is the same as step S30 in FIG.

3. Modifications The present invention includes substantially the same configuration (configuration with the same function, method and result, or configuration with the same purpose and effect) as the configuration described in the embodiment. In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. Further, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

  In addition, the sheet manufactured by the sheet manufacturing apparatus 100 mainly indicates a sheet shape. However, it is not limited to a sheet shape, and may be a board shape or a web shape. The sheet in this specification is divided into paper and non-woven fabric. The paper includes a mode in which pulp or used paper is used as a raw material and is formed into a thin sheet, and includes recording paper for writing and printing, wallpaper, wrapping paper, colored paper, drawing paper, Kent paper, and the like. Nonwoven fabric is thicker than paper or low in strength, and includes general nonwoven fabric, fiber board, tissue paper, kitchen paper, cleaner, filter, liquid absorbent material, sound absorber, cushioning material, mat, and the like. The raw material may be plant fibers such as cellulose, chemical fibers such as PET (polyethylene terephthalate) and polyester, and animal fibers such as wool and silk.

  After the airflow control by each activation control in FIGS. 3, 5, and 7, the sorting unit 40 and the loosening unit 60 may be activated. Moreover, you may stop the selection part 40 and the loosening part 60 before each stop control of FIG.4, FIG.6, FIG.8.

  In addition, a moisture sprayer for spraying and adding moisture to the deposit accumulated in the deposition unit 72 may be provided. Thereby, the intensity | strength of the hydrogen bond at the time of shape | molding the sheet | seat P can be made high. The spray addition of moisture is performed on the deposit before passing through the heater roller 76. Starch, PVA (polyvinyl alcohol), or the like may be added to the moisture sprayed by the moisture sprayer. Thereby, the strength of the sheet P can be further increased.

  In the above example, the form in which the sheet P is taken up by the take-up roller 78 has been described. However, the sheet P may be cut into a desired size by a cutting machine (not shown) and stacked on a stacker or the like.

  The sheet manufacturing apparatus 100 may not include the crushing unit 10. For example, if the material is roughly crushed with an existing shredder or the like, the crushing unit 10 is not necessary.

  The 5th conveyance part 85 as a return channel may not be. The residue may be collected and discarded without returning to the defibrating unit 20. Further, if the defibrating unit 20 has such a performance that no residue is left, the fifth transport unit 85 is not necessary.

  In the present application, “fibers” in “deposit a fiber to generate a deposit” and “form a sheet using the fiber” may be all of the fibers classified by the classification unit 30. In addition, it may be a part of the fiber material classified by the classification unit 30 (passed material that passes through the sorting unit 40), and includes a fiber material to which a resin or the like is added.

DESCRIPTION OF SYMBOLS 10 Crushing part (supply part), 11 Crushing blade, 15 hopper, 16 hopper, 20 Defibration part, 21 Inlet, 22 Outlet, 30 Classifying part, 31 Inlet, 34 Lower outlet, 35 Upper outlet , 40 sorting section, 46 inlet, 47 outlet, 50 resin supply section, 51 supply port, 60 unraveling section, 66 inlet, 70 molding section, 72 deposition section, 74 stretching roller, 76 heater roller, 77 tension roller 78, take-up roller, 79 suction device (suction unit), 81 first transport unit, 82 second transport unit, 83 third transport unit, 84 fourth transport unit, 85 fifth transport unit, 86 sixth transport unit, 87 Blower after defibration, 88 Exhaust blower, 89 Conveyor blower, 90 Waste collection container, 92 Fine powder collection container, 100 Sheet manufacturing device, 110 Control unit, 111 1st Driver, 112 a second driver, 113 a third driver, 114 a fourth driver, 115 a fifth driver 116 sixth driver 120 operating unit

Claims (4)

A supply unit for supplying a material containing fiber;
A defibrating unit for defibrating the material in air;
A classifying unit that classifies the defibrated material defibrated in the defibrating unit into fiber and waste by airflow;
A molding part for molding a sheet using the fiber,
An exhaust blower for discharging the waste from the classification unit with an air flow so as not to go to the molding unit side, and a sheet manufacturing apparatus comprising:
When the production by the sheet production apparatus is stopped, the sheet production apparatus is stopped in the order of the supply unit, the defibrating unit, and the exhaust blower.   2. The sheet manufacturing apparatus according to claim 1, wherein when the manufacture by the sheet manufacturing apparatus is stopped, the defibrating unit is stopped after the defibrating unit is driven for a time during which the residue in the defibrating unit can be discharged. Further comprising a blown after defibration that sends the defibrated material to the classification part by airflow;
3. The sheet manufacturing apparatus according to claim 1, wherein when the manufacture by the sheet manufacturing apparatus is stopped, the supply unit, the defibrating unit, the blower after defibration, and the exhaust blower are stopped in this order. Supplying a material containing fibers by the supply unit;
A step of defibrating the material in the air by a defibrating unit;
A step of classifying the defibrated material that has been defibrated into fiber and waste by airflow by the classifying unit;
A step of forming a sheet using the fiber material by a forming unit;
Discharging the waste from the classification part with an air flow so as not to go to the molding part side by an exhaust blower,
When the production of the sheet is stopped, the production method of the sheet is stopped in the order of the supply unit, the defibrating unit, and the exhaust blower.

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